(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A vessel of capacity 3 m3 contains air at a pressure of 1.5 bar and a

temperature of 25o C. Additional air is now pumped into the system until the

pressure rises to 30 bar and temperature rises to 60o C. The molar mass of air

is 28.968 g/mol.

2. Relevant equations

Calculate:

(i) The mass of air pumped into the system.

3. The attempt at a solution

I am not sure of the equation i should be using. I thought i should be using n=m/M but i do not know number of moles.

PS: This is my own revision and not homework. I have a University exam on monday and am struggling loads with thermodynamics. I feel I am missing a lot of the equations i should need, does anyone have a link to a list of them? The material my lecturers gave me is not very helpful.

Thanks

Any help appreciated

Nathan

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Thermodynamics: Calculating mass of air over a change in pressure/temperature

**Physics Forums | Science Articles, Homework Help, Discussion**